Wearable Motor Driver Switching for Adaptive Exercise Load
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Solution Overview
Problem
Existing walking assistance devices fail to provide an effective exercise load that adapts to the user's changing motion speed, leading to inconsistent and potentially uncomfortable exercise experiences.
Innovation Solution
A wearable device with a motor driver circuit and processor that alternates between closed and open loop states to generate an exercise load, adjusting the duration of each state based on the user's motion speed, allowing for adaptive resistance without direct motor power usage, thereby enhancing exercise effectiveness and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor driver circuit operates in closed loop state continuously to provide exercise load, then the exercise effectiveness is improved, but the power consumption increases
Solution Approach 1:
The motor driver circuit alternates between closed loop and open loop states in periodic intervals. The closed loop state provides exercise load when needed, while the open loop state reduces power consumption during periods when less resistance is required. This periodic switching resolves the contradiction by providing exercise effectiveness only when necessary rather than continuously.
Solution Approach 2:
The system dynamically adjusts the operating state of the motor driver circuit based on real-time detection of user motion speed. When the user moves faster, the system transitions to closed loop state to provide exercise resistance. When speed decreases, it switches to open loop state to conserve energy. This dynamic adaptation resolves the contradiction by matching power consumption to actual exercise needs.
2Adaptability or versatility
If the motor driver circuit switches frequently between closed and open loop states to adapt to speed changes, then the adaptability to user motion is improved, but the device complexity increases
Solution Approach 1:
The system uses sensor feedback to detect user motion speed and automatically adjusts the motor driver circuit state accordingly. The feedback mechanism compares detected speed with target speed and triggers state transitions only when necessary, avoiding unnecessary switching complexity while maintaining adaptability to user motion changes.
Solution Approach 2:
The system changes the operational parameters of the motor driver circuit (switching between closed and open loop states) based on detected motion parameters. By monitoring speed changes and triggering state transitions based on predefined thresholds, the system achieves adaptability without requiring complex control algorithms, thus resolving the contradiction between adaptability and complexity.
3Stability of the object's composition
If the duration of closed loop state is increased to provide consistent exercise load, then the exercise load consistency is improved, but the exercise comfort deteriorates
Solution Approach 1:
The system implements periodic switching between closed and open loop states rather than maintaining continuous closed loop operation. This creates a rhythm of resistance application that maintains average exercise load consistency while providing relief periods, thereby improving user comfort without sacrificing overall exercise effectiveness.
Solution Approach 2:
The duration of closed loop state is dynamically adjusted based on detected motion speed. When users move faster, closed loop duration increases to maintain exercise load consistency. When speed decreases, duration reduces to improve comfort. This dynamic adjustment resolves the contradiction by adapting load consistency requirements to actual user performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The wearable device provides a consistent and adjustable exercise load that matches the user's motion speed, improving exercise experience and extending device runtime while minimizing noise and power consumption.
Implementation Method 1
a motor driver circuit connected to the motor; a processor configured to generate a control signal to control an electrical connection in the motor driver circuit to provide the exercise load through the frame according to a speed of the body motion by controlling, based on the speed of the body motion, a changing ratio per time between a first control state and a second control state, the first control state being a state in which the electrical connection in the motor driver circuit is a closed loop
Data Source
AI summary
A wearable device may include a motor, a motor driver circuit, a frame connected to the motor, the frame to be worn on the body of the user to support the body, a processor configured to generate a control signal to control an electrical connection in the motor driver circuit, and a sensor configured to sense a body motion of the user. The processor is further configured to provide an exercise load through the frame according to a speed of the sensed body motion by controlling, based on the speed of the body motion, a changing ratio per time between a first control state in which the electrical connection in the motor driver circuit is a closed loop and a second control state in which the electrical connection in the motor driver circuit is an open loop.